Study On Pressure Hydraulic Tunnel Seepage Field's Mechanical Effect And Its Application

The seepage is existing in the underground engineering commonly; it brings great hidden danger for construction engineering. Rock mass seepage not only softens rock mass, reduces rock mass'mechanical indicator, but also composes the main loads of underground engineering. So it's very important to simulate underground engineering internal and external water seepage field reasonably.This thesis is set up in Shenzhen samall hydraulic tunnel.Using flac numerical simulation studies the tunnel under different depth of burial, different surrounding rock, different external water force, different internal water force, different tunnel section; it can get the following conclusions:â‘ Through the numerical stimulating results of tunnel cavern surrounding rock's release of stress and rock and supporting co-operation, gets the stress(maximum tension stress, maximum shearing stress) on primary lining and secondary lining and loads(shearing force, axial force, bending moment) on lining section under different tunnel section, different surrounding rock, different depth of burial, different supporting. The computing results can directly take as design reference. The maximum tension stress and maximum shearing stress can take as lining safe bearing load's base of judgment. The lining section shearing force, axial force, bending moment can take as allocation steel or other reinforcement measures'base.â‘¡Through the numerical stimulating seepage field under different tunnel section, different surrounding rock, different depth of burial, different supporting,different groundwater level(select 15m, 30m, 50m, 70m), gets the surrounding rock and ling's seepage distribution and water head at interface, also gets the influence from surrounding rock and lining's permeability coefficient ratio to seepage field.â‘¢Through the numerical stimulating seepage field under different tunnel section, different surrounding rock, different depth of burial, different supporting,different internal water head(select 5m, 30m, 60m, 90m), gets the surrounding rock and ling's seepage distribution and water head at interface, also gets the influence from surrounding rock and lining's permeability coefficient ratio to seepage field.â‘£Through the numerical stimulating internal and external seepage field and surrounding rock stress field's coupling under different conditions, gets the lining methods and its safety load evaluation.